{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["machine or equipment", "machanical property", "biomedical", "manufacturing standard", "application", "process parameter"], "input": "While a lot of research effort has been focused on different technologies ( such as Powder Bed Fusion ) , there is still quite limited knowledge concerning the structural response of Wire-and-Arc Additive Manufactured ( WAAM ) metallic elements , as very few experimental campaigns aimed at assessing their geometrical and mechanical properties have been carried out ."}
{"machine or equipment": [], "machanical property": [], "biomedical": [], "manufacturing standard": [], "application": [], "process parameter": []}